I'm thinking of buying the Pioneer 520 but have a lot of material reocorded on DVD+R and DVD+RW. Will the Pioneer play them back? The discs have been recorded via PC and play back on my Philips 728 DVD player - I realise Philips are the champion of the + format. Would DVD-R or DVD-RW play back on the Philips? If they won't, is this just a feature of Philips machines or will all DVD palyers only play one or other of the competing formats? Thanks.